• Glucose is?broken down in stages, each of which consists of a series of chemical reactions
• These chemical reactions are controlled by?intracellular enzymes?that catalyses reactions within the cell
• This ensures that the energy trapped within the chemical bonds of the glucose molecule is?released gradually?and not all at once
• A sudden release of such a large amount of energy would result in an increase in body temperature to levels that would?denature?enzymes
• Each stage of aerobic respiration occurs at a particular location in a eukaryotic cell:
  • Glycolysis?takes place in the cell cytoplasm
  • The?Link reaction?takes place in the matrix of the mitochondria
  • The?Krebs cycle?takes place in the matrix of the mitochondria
  • Oxidative phosphorylation?occurs at the inner membrane of the mitochondria

Four Stages of Respiration Table